Which of the following statements are true according to Passage A?
A.
The birth year of Beijing Opera is commonly set in the year of the eightieth birthday of the Qianlong Emperor.
B.
Kunqu Opera was known for its elegant music and fine language.
C.
Mei Langfang performed in the united states in 1935 and Europe in 1930 .
D.
Mei Langfang was the most famous actor of Beijing Opera in the first half of the twentieth century .